Answer:
2 real roots
Step-by-step explanation:
If the discriminant is >0 then the equation has 2 real roots
If the discriminant is =0 then the equation has 1 real roots
If the discriminant is <0 then the equation has 2 complex roots
since the discriminant is 4, it has 2 real roots
Answer:
(1,1)
Step-by-step explanation:
I will help u let me look at it
Answer: The type is <u>Retrospective</u>.
Step-by-step explanation: Observational Study is a type of research which measures determined characteristics of a population by studying individuals in a sample, without interfering or influencing the variables. There are 3 types of observational study:
- Cross-sectional studies: colecting data at a certain point of time;
- Case-control studies: comparing individuals with a particular characteristics with others without it;
- Cohort studies: is the one where a group of individuals is selected to participate in the study;
According to the description given, the study above is a case-control study and the type is called <u>Retrospective</u> because it asks the individuals to tell about past habits, exposure to sunshine in this case. This type of study is not very reliable because it depends on the memory and the ability of the individuals to be honest and it can only prove association, not causation.
It's 4 buns & 5 cakes
Hope my explanation to the other one helps, if not, you can draw them; while following the steps & you may get it better.
E.g draw a box for the bun & a circle for the cake, then, adding them up to get the 95p. Also, you keep taking away from 435p